Endress+Hauser liquisys CPM 252 Manuel utilisateur
BA 169C/07/en/04.98
No. 50087273
Software version 1.01 or later
liquisys
CPM 252
Transmitter/Controller
for pH and Redox
Operating Instructions
Hauser+Endress
Nothing beats know-how
Please familiarise yourself with the instrument before you
take any other steps:
General information
Safety
Description
You wish to install and start up the instrument. The
required steps are described in these chapters:
Installation
First start-up
You wish to operate or reconfigure the instrument. The
operating concept is explained in these chapters:
Operation
Instrument configuration
See the back cover for a fold-out overview of the menu
structure.
When you encounter problems or when the instrument
requires maintenance, refer to these chapters for help:
Diagnostics
Maintenance and service
Table of contents
1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Symbols used ............................................2
1.2 Conformity statement ........................................2
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Intended use .............................................3
2.2 General safety notes .........................................3
2.3 Safety devices ............................................3
3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Areas of application .........................................4
3.2 Measuring system ..........................................4
3.3 Important features ..........................................5
3.4 Instrument variants ..........................................6
3.5 Accessories .............................................7
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Storage and transport ........................................9
4.2 Unpacking ..............................................9
4.3 Mounting.............................................. 10
4.4 Connection............................................. 12
4.5 Packaging and disposal ...................................... 17
5 First start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Measures before first power-up .................................. 18
5.2 Power-up, factory settings ..................................... 19
5.3 First configuration and calibration ................................. 20
5.4 Test ................................................ 20
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 Operator interface ......................................... 21
6.2 Display elements .......................................... 21
6.3 Keyfunctions ........................................... 23
6.4 Operating concept ......................................... 24
6.5 Operation example ........................................ 26
6.6 Auto / manual mode of operation ................................. 28
7 Instrument configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1 Offset adjustment ......................................... 30
7.2 Selection of temperature compensation ............................. 31
7.3 Limit contactor configuration , ................................... 32
7.4 Controller configuration ...................................... 33
7.5 Current output measuring range selection ............................ 36
7.6 General instrument configuration ................................. 37
7.7 Calibration of measuring transmitter ............................... 38
8 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8.1 Alarm................................................ 42
8.2 Errors ................................................ 42
8.3 Possible faults in measuring mode and elimination ........................ 44
9 Maintenance and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
9.1 Cleaning.............................................. 46
9.2 Repair ............................................... 46
10 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
10.1 Technical data ........................................... 47
10.2 Index ................................................ 50
liquisys CPM 252 Table of contents
Endress+Hauser 1
1 General information
1.1 Symbols used
Warning:
This symbol alerts to hazards which may cause serious injuries as well as damage to
the instrument, measuring system or other equipment if ignored.
Caution:
This symbol alerts to possible malfunction due to operator error.
Note:
This symbol indicates important items of information.
1.2 Conformity statement
The pH and redox measuring instrument / controller Liquisys CPM 252 has been developed and
manufactured in accordance with the applicable European standards and directives.
Note:
The corresponding certificate of conformity may be requested from Endress+Hauser.
General information liquisys CPM 252
2 Endress+Hauser
2 Safety
2.1 Intended use
The measuring transmitter Liquisys CPM 252 is a field-tested and reliable measurement and
control device for determining pH values and redox potentials. It is equipped with two current
outputs and two switched outputs for connection to automated process controllers.
2.2 General safety notes
Warning:
●Operation of the device in a manner other than as described in these operating
instructions may lead to unsafe and improper functioning of the measuring system.
Installation, start-up, operation
The Liquisys CPM 252 instrument has been designed for safe operation according to the state
of the art in engineering and in keeping with the applicable regulations and EC directives; see
“Technical data”. However, if used improperly or other than for the intended purpose, it may
pose a hazard, e.g. due to improper connection.
Installation, electrical connection, start-up, operation and maintenance of the measuring system
must therefore be performed exclusively by trained specialists authorised by the system
operator. This personnel must have read and understood these operating instructions and must
adhere to them.
2.3 Safety devices
●Access code:
Unauthorised access to the calibration and configuration data of the measuring transmitter is
effectively prevented by access codes. The instrument settings can be read at any time
without entry of an access code.
●Alarm function:
Continuous violation of the limit settings or temperature sensor failure will activate an alarm.
This condition is indicated by an LED on the control panel and via a switched output. The
alarm contact has been designed as a fail-safe switch, i.e. the alarm condition will be
immediately signalled in case of a power failure. The alarm contact is also activated by
internal system errors (see 8.2).
●Data protection:
The instrument configuration is retained even after a power failure.
●Immunity to interference:
This instrument is protected against interference, such as pulse-shaped transients, high
frequency and electrostatic discharges, according to the applicable European standards.
This is only valid, however, for an instrument connected according to the notes in these
installation and operating instructions.
liquisys CPM 252 Safety
Endress+Hauser 3
3 Description
3.1 Areas of application
The measuring transmitter Liquisys CPM 252 is suitable for measuring and control tasks in the
following areas of application:
●Water treatment and water monitoring
●Effluent treatment
●Neutralisation
●Detoxification in the electroplating industry
3.2 Measuring system
pm252sys.cdr
Immersion
assembly
CPA 111
Process
assembly
CPA 440
Electrode
e.g. Orbisint CPS 11
with integr. Pt 100
Flow assembly
CPA 250
Junction
box VBA
Liquisys CPM 252
Measuring
cable
e.g. CPK 7
2 limit contacts
(i, f, s/w control)
1 alarm contact
Current output 1: pH / mV
0/4 ... 20 mA
15 V supply voltage
HOLD
Auxiliary energy (mains)
Current output 2: temp.*
0/4 ... 20 mA
* optional
Fig. 3.1 Example of a complete measuring system
Description liquisys CPM 252
4 Endress+Hauser
A typical measuring system comprises:
●a pH combination electrode with or without integrated temperature sensor Pt 100 or a redox
combination electrode
●an additional temperature sensor Pt 100 if used with electrodes without an integrated
temperature sensor
●an appropriate immersion, flow or retractable assembly with or without potential matching pin
●an appropriate pH or redox measuring cable
●the Liquisys CPM 252 measuring transmitter
3.3 Important features
●Field housing with protection type IP 65
●Measuring range pH 0 ... 14 / ±1000 mV
●Switching between pH and redox potential measurements
●Temperature measurement -9.9 ... +125 °C
●Easy to read, two-line display
●Simple configuration with only three keys
●Configuration protected by access code
●Quick calibration using the “CAL”key
●Two switched outputs which can be configured as a pulse length controller, pulse frequency
controller or limit contactor
●One switched output for alarm signalling in cases of limit violation or temperature sensor
failure
●Two current outputs with selectable measurement range, switchable between 0 ... 20 or
4 ... 20 mA (switching affects both outputs)
●Automatic “hold”function to “freeze”the current output and switched outputs during calibrati-
on and configuration
●“Hold”function via a galvanically separated input, can be controlled using an external or
internal auxiliary voltage
liquisys CPM 252 Description
Endress+Hauser 5
3.4 Instrument variants
You can identify the device variant and the
mains supply type by the order code on the
nameplate of the instrument.
Composition of order code
Version / measuring range
PR Field housing, 247 x 170 x 115 mm, protection type IP 65
Switchable to pH or redox measurement
Power supply
0 Power supply: 230 V AC
1 Power supply: 115 V AC
2 Power supply: 200 V AC
3 Power supply: 24 V AC
5 Power supply: 100 V AC
8 Power supply: 24 V DC
9 Special version to customer specifications
Measurement output
0 Meas. output: pH/redox
1 Meas. output: pH/redox and temperature
9 Special version to customer specifications
Additional features
10 Base version
20 Moisture protection lacquering
CPM 252- ⇐complete order code
typ252ph.cdr
Fig. 3.2 Nameplate of Liquisys CPM 252
Description liquisys CPM 252
6 Endress+Hauser
3.5 Accessories
Endress+Hauser offer a wide selection of matching electrodes and assemblies for the Liquisys
measuring instrument which are designed for special applications. An overview of these ap-
pears below.
Electrodes
Please refer to the electrode catalogue (order no. 50071679) for further information on electro-
des and measuring cables.
Type Features Areas of application
Orbisint
CPS 11/12/13
Universally applicable, easily cleanable and
soiling-resistant thanks to PTFE diaphragm,
pressures of up to 6 bar,
conductivity > 50 µS/cm
General process
engineering
Industrial waste water
Detoxification
(cyanogen, chromium)
Neutralisation
Ceratex
CPS 31/32/33
Inexpensive electrodes with ceramic
diaphragm, long life
Drinking water
Swimming pools
Ceraliquid
CPS 41/42/43
Electrodes with ceramic diaphragm and KCl
liquid electrolyte, for use with counterpressure,
resistant to pressures of up to 8 bar
Ultrapure water
Boiler feed water
liquisys CPM 252 Description
Endress+Hauser 7
Assemblies
Buffer solutions
Type Features Areas of application
Dipsys
CPA 111
Immersion assembly with DN 100 flange,
bayonet mounting for fast electrode installation
and removal, integration of Chemoclean
electrode cleaning system is possible without
modification
Open and closed
containers and tanks
Channels
Probfit
CPA 440 Process assembly for one pH/redox
electrode, usable with pressures of up to 6 bar
Pipelines
Containers and tanks
CPA 250-A Flow assembly for up to three electrodes,
syphon-type design keeps sensors wet even if
there is no flow through pipeline
Pipelines
Type Features / contents Areas of application
CPY 2
pH 4.0 red, contents: 100 ml
(order no. CPY 2 - 0)
pH 7.0 green, contents: 100 ml
(order no. CPY 2 - 2)
pH calibration (reference
temperature 25 °C)
CPY 3
+225 mV, pH 7.0, contents: 100 ml
(order no. CPY 3 - 0)
+475 mV, pH 0.0, contents: 100 ml
(order no. CPY 3 - 1)
Redox calibration
(measured at 25 °C with
PtAg or AgCl measuring
chain)
Description liquisys CPM 252
8 Endress+Hauser
Table des matières
Autres manuels Endress+Hauser Panneau de contrôle
